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Bosch AquaStar 125FX LP Installation And Operating Instructions Manual

Automatic instantaneous type water heater for use with natural and liquefied petroleum gas
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BOSCH
INSTALLATION
AND
OPERATING
INSTRUCTIONS
FOR
AUTOMATIC
INSTANTANEOUS
TYPE
WATER
HEATER
FOR
USE
WITH
NATURAL
AND
LIQUEFIED
PETROLEUM
GAS
MODEL 125FX LP and 125FX NG
(Flow Modulated with Electronic Ignition and Power Venting)
Suitable
for heating
potable
water only
Not approved
for space heating purposes
Intended
for variable
flow applications
with steady
cold water
inlet temperatures
WARNING
If the information
in this manual is not followed
exactly. A
fire or explosion
may result causing
property
damage,
personal
injury or death.
FOR YOUR SAFETY
Do not
store
or use
gasoline
or other
flammable,
combustible
or corrosive
vapors and liquids in the vicinity
of this or any other appliance.
WHAT TO DO IF YOU SMELL GAS
- Close gas valve. Open windows.
- Do not try to light any appliance.
- Do not touch any electrical
switch;
do not use any
phone in your building.
- Immediately call your gas supplier from a neighbor's
phone. Follow the gas supplier's instructions.
- If you cannot reach your gas supplier, call the fire
department.
- Installation
and service must be performed
by a
qualified installer, service agency or the gas supplier.
.-J
,<
O
WARNING:
Improper
installation,
adjustment,
alteration,
service or maintenance
can cause
®
injury
or property
damage.
Refer
to this
manual.
For
LO
o
assistance
or additional
information
consult
a qualified
LO
o
installer,
service
agency
or the gas supplier.
Upon completion
of the installation,
these
instructions
should
be handed
to the user of the appliance
for future
reference.
In the Commonwealth
of Massachusetts
this product
must be installed
by a licensed
plumber
or gas fitter.
FEATURING:
Electronic
Ignition and Power Venting
TABLE OF CONTENTS
Specifications
............................................. Page 2
Rules for safe operation
........................... Page 4
Locating
the Heater .................................. Page 4
Combustion
Air Requirements
................ Page 5
Mounting
the Heater ................................. Page 6
Venting the Heater .................................... Page 7
Gas Connections
.................................... Page 10
Water Connections
................................. Page 12
Electrical
Safety before turning
on the heater .... Page 14
Lighting and Operating
instructions
.... Page 14
Setting water temperature
..................... Page 14
Maintenance
& Service .......................... Page 15
Trouble Shooting
...................................... Page 16
Diagram of AquaStar
.............................. Page 19
Components
and Parts List .................. Page 20

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  Summary of Contents for Bosch AquaStar 125FX LP

  • Page 1: Table Of Contents

    BOSCH INSTALLATION OPERATING INSTRUCTIONS AUTOMATIC INSTANTANEOUS TYPE WATER HEATER WITH NATURAL LIQUEFIED PETROLEUM MODEL 125FX LP and 125FX NG (Flow Modulated with Electronic Ignition and Power Venting) Suitable for heating potable water only Not approved for space heating purposes Intended...
  • Page 2 Principle o f Operation: AquaStar 125FX LP and 125FX NG Specifications When ahotwater f aucet isopened, theflowofwater t hrough AQ125FXNG AQ125FXLPG theheater c auses t hegasvalve toopen. A tthesame time a microswitch isactivated w hich sends aspark tothepilot. max. 130 000 Btu/hr 125 000 Btu/hr Gas input Theflamesensor c onfirms t hatthe pilothasbeenlighted...
  • Page 3 83/4 `` 18¼" 6"Y4" I........2_/2 '' REAR SLOTB © 8" 7" _, _, _ 8"_ _ATER"_LETAT'_EAR°P"EATE'_ _FLEXIBLE ELBOW PROVIDED) 3"J 9" WATER OUTLET 6720606601.,01.3JS FRONT VIEW SIDE VIEW MINIMUM INSTALLATION CLEARANCES FROM COMBUSTIBLE AND NON COMBUSTIBLE MATERIALS FOR ALCOVE OR CLOSET INSTALLATIONS /////////////// MODEL 125FX TOP (A)
  • Page 4 GENERAL RULES TO FOLLOW The heater may still operate even when improperly vented. It will, however, be less efficient and could eventually damage FOR SAFE OPERATION the heater. It could even result in human sickness or death due to oxygen deprivation and carbon monoxide poisoning.
  • Page 5 COMBUSTION AIR REQUIREMENTS Appliances located in confined spaces: The confined space must be provided with permanent openings, The AquaStar water heater holds cold water in its copper commencing within 12 inches of the heat exchanger and brass water valve when not in use.
  • Page 6 MOUNTING INSTALLATION The incandescent particle tray (shipped loose in the carton with the water heater) must be attached at the bottom the water heater front cover at the time of installation. The Aquastar 125FX is design certified for mounting on a the screws provided.
  • Page 7 from the total vent length for each additional 90-degree elbow used. No more than four 90-degree elbows may be VENTING used. Any short vertical portion of vent pipe used in the vent system shall be considered part of the allowable feet (4.6 m) maximum run.
  • Page 8 Installing Flue collar Remove 4 screws from the top of the heater leaving the plate in place. The supplied exhaust collar must be fitted to this heater before connecting the vent, align the exhaust collar and tighten with the 4 screws. 4"single wall venting only.
  • Page 9 The approved vent terminal must be installed so that flue gases will not jeopardize people, overheat combustible structures or enter into buildings, and so that proper clearances are maintained (See Fig 5). The vent terminal shall not be less than 7 feet above a public walkway. The vent terminal shall terminate at least 3 feet above any (mechanical) air inlet within...
  • Page 10 GAS LINE SIZING -It is strongly recommended that the Natural Gas pipe GAS CONNECTIONS be Black Iron pipe the entire distance from the outside meter to the inlet of the Aquastar regulator. 1/2" Black Iron pipe up to 10 feet, 3/4" Black Iron pipe up to 40 feet and 1"...
  • Page 11 FOR NATURAL Maximum Capacity of pipe in Cubic Feet of Gas per Hour for Gas Pressure of 0.5 Psig or less and a Pressure drop of 0.3 in Water Column (0.75mbar).(Based on a 0.60 Specific Gravity Gas) Btu numbers given in thousands.
  • Page 12: The Heater

    Connecting the pressure relief valve (PRV) WATER CON N ECTIONS The listed pressure relief valve supplied with the heater must be installed at the time of installation. Should a discharge line be added to the PRV no valve is to be placed between the PRV and the heater.
  • Page 13 ELECTRICAL CONNECTIONS WARNING: For safety reasons, disconnect the power supply to the heater before any service or testing is performed. WARNING: This heater must be electrically grounded in accordance with the most recent edition of the National Electrical Code, NFPA 70. In Canada, all electrical wiring to the heater should be in accordance with local codes and the Canadian...
  • Page 14: The Heater

    OPERATING INSTR UCTIONS 6. Turn the hot water faucet on to the minimum flow required to activate the heater. The automatic ignition system first Before operating the heater, make sure that the system is ignites the safety pilot burner which then ignites the main filled with water.
  • Page 15 140 ° and 95°F at various flow rates between 2.0 and 4.0 Water Valve .(Part # 8707002802): The water valve on gallons minute. position select on the this heater should be serviced periodically. Lubricate temperature selector dial will depend on the temperature component #36 on page 22 with a small amount of silicon, the incoming...
  • Page 16 Main Burner Flames: The main burner flames should 6. Cross over in water lines blue, with a more intense blue cone in the center core. Yellow To confirm there is no cross-over in the plumbing, shut off flames could be a sign of wrong size gas orifices or dirty the cold water supply...
  • Page 17 SPARKS APPEAR AT PILOT WHEN HOT WATER TAP IS 4. The Control Box may need to be replaced (see Fig. 9). TURNED ON, BUT PILOT AND BURNERS WILL NOT IGNITE Check wire connections and test operation of control 1. Air in the Gas Line (see Fig 9).
  • Page 18: Connections

    WATER IS TOO HOT HOT WATER TEMPERATURE FLUCTUATES / UNIT DEACTIVATED 1. Temperature Selection too high 1. Unbalanced pressure in waterlines Turn the temperature adjustment knob counter-clockwise The added restriction caused by the Aquastar in the hot (to the left) to lower the maximum water temperature. Note: This will increase the activation flow rate.
  • Page 19 Fig. 15 Diagram of AquaStar 125FX 6 720 601-12.1AL electric control Heat exchanger Power cord Pilot assembly on/off switch Burner manifold pressure test nipple Temperature adjustment selector Microswitch Main gas burner Pilot gas tubing Gas inlet gas pressure test nipple Gas valve Exhaust Flexible hot outlet...
  • Page 20 Fig. 16 - INTERIOR COMPONENTS DIAGRAM AND PARTS LIST 5-_. \< //26 6720606601 -O?.5J 6 720 606 601...
  • Page 21: And Parts List

    Fig. 16 INTERIOR COMPONENTS DIAGRAM PARTS LIST 125FX 8 705 421 775 Cover 8 702 000 111 Temperature adjustment knob 8 700 403 008 Temperature adjustment collar 8 705 505 451 Draft diverter 8 705 406 235 Heat exchanger 8 707 206 040 Overheat sensor (ECO) 8 708 120 298 Main burner...
  • Page 22 Fig.17 Flow chart of Aquastar 125 FX Operation Safety (safety circuit always active reactive anytime during operation of the appliance) Sa_et: I _° _a_ _ f_yd_iooI Stop opeta_ o_ / Closr- all -ye_B_ _4a_n _ ume[ elect _ov_Jve off Fan off Spark off Pilot off yes --...
  • Page 23: Warranty

    340 Mad River Park Waitsfield, VT 05673 Exceptions Phone: 800-642-3111 This warranty will not apply: www.bosch hotwater.com 1. to defects or malfunctions resulting from failure to properly install, operate or maintain the unit in accordance with the printed instructions provided;...
  • Page 24 MAiN BURNER '1" Replacement Parts available from: BBT NORTH AMERICA Bosch Group VU LCANO Termodomesticos S.A. Bosch Water Heating Estrada de Cacia 340 Mad River Park 3801 - 856 Aveiro - PORTUGAL Waitsfield, VT 05673 Phone 800-642-3111 Fax (802) 496-6924 www.boschhotwater.com...

This manual is also suitable for:

Aquastar 125fx ng